Add package.json so it can be installed with npm

With this package.json, you'll be able to do:

    npm install git://github.com/stringham/BZRFlag-nodejs-client.git

Or you can add it as a dependency to your agent's package.json:

    {
    	"name": "tb-bzagent",
    	"version": "0.0.1",
    	"dependencies": {
    	    "BZRFlag-nodejs-client": "stringham/BZRFlag-nodejs-client"
    	}
    }